Power conversion device and control circuit including stop transitioning to stop state

Patent metadata

Field	Value
Publication number	US-10389247-B2
Application number	US-201815935104-A
Country	US
Kind code	B2
Filing date	Mar 26, 2018
Priority date	Jun 30, 2017
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A power conversion device according to one or more embodiments may include: a microcomputer; and an output circuit controlled by the microcomputer, including an output unit that converts an input power into a predetermined power and outputs the predetermined power, an internal power source that supplies a power source to the microcomputer, a driver that drives the output unit by a signal from the microcomputer, and a microcomputer stop transition unit that, when an operation of the power conversion device is stopped, outputs a microcomputer stop signal to the microcomputer and causes an operation of the microcomputer to transition to a stop state. In one or more embodiments, after the microcomputer stop transition unit causes the operation of the microcomputer to transition to a stop state, the microcomputer or the output circuit may stop an output of the internal power source.

First claim

What is claimed is:

1. A power conversion device comprising:
a microcomputer; and
an output circuit controlled by the microcomputer, comprising
an output unit that converts an input power into a predetermined power and outputs the predetermined power,
an internal power source that supplies a power source to the microcomputer,
a driver that drives the output unit by a signal from the microcomputer, and
a microcomputer stop transition unit that performs operations comprising, in response to an operation of the power conversion device being stopped, outputting a microcomputer stop signal to the microcomputer causing an operation of the microcomputer to transition to a stop state, wherein:

after the microcomputer stop transition unit causes the operation of the microcomputer to transition to the stop state, the microcomputer or the output circuit stops an output of the internal power source; and
in response to the microcomputer stop transition unit detecting a malfunction of the microcomputer that prevents the microcomputer or the output circuit from stopping the output of the internal power source, the microcomputer stop transition unit generates a signal that stops the output of the internal power source.

2. The power conversion device according to claim 1 , wherein
in response to the microcomputer being in a state in which the microcomputer is to be stopped, the microcomputer outputs an internal power source stop signal to the internal power source, and transmits the internal power source stop signal to the internal power source.

3. The power conversion device according to claim 1 , wherein
the output circuit comprises a timer that measures a predetermined time from the output of the microcomputer stop signal to the microcomputer by the microcomputer stop transition unit, and after the predetermined time is measured, transmits an internal power source stop signal to the internal power source.

4. The power conversion device according to claim 3 , wherein
the predetermined time is set to a time, from an input of the microcomputer stop signal, greater than or equal to a time taken for the microcomputer to achieve a state in which the microcomputer is to be stopped.

5. The power conversion device according to claim 3 , wherein
the microcomputer stop transition unit comprises an overheat detector that, when a temperature of the output unit becomes higher than or equal to a threshold temperature, outputs an overheat detection signal to the microcomputer as the microcomputer stop signal.

6. The power conversion device according to claim 1 , wherein
the microcomputer stop transition unit comprises an enable circuit that turns on and off an output of the power conversion device by an enable signal, and outputs the enable signal to the microcomputer as the microcomputer stop signal.

7. The power conversion device according to claim 1 , wherein
the microcomputer stop transition unit comprises a low input detector that, when an input voltage of the internal power source becomes lower than or equal to a threshold voltage, outputs a low input signal to the microcomputer as the microcomputer stop signal.

8. The power conversion device according to claim 1 , wherein
the microcomputer stop transition unit comprises a low input detector that, when an input voltage of the power conversion device becomes lower than or equal to a threshold voltage, outputs a low input signal to the microcomputer as the microcomputer stop signal.

9. The power conversion device according to claim 1 , wherein
the microcomputer stop transition unit comprises a low input detector that, when an output voltage of the power conversion device becomes lower than or equal to a threshold voltage, outputs a low input signal to the microcomputer as the microcomputer stop signal.

10. The power conversion device according to claim 1 , wherein
the microcomputer stop transition unit comprises an overheat detector that, when a temperature of the output unit becomes higher than or equal to a threshold temperature, outputs an overheat detection signal to the microcomputer as the microcomputer stop signal.

11. The power conversion device according to claim 10 , further comprising
an internal power source judging circuit that, after the overheat detector outputs the overheat detection signal to the microcomputer, monitors an internal power source output of the internal power source, and when the internal power source output is outputted after elapse of a certain time, stops the output of the internal power source.

12. The power conversion device according to claim 1 , wherein
the microcomputer stop transition unit comprises a threshold overheat detector that detects a first threshold temperature, and a second threshold temperature higher than the first threshold temperature, wherein when a temperature of the output unit rises and exceeds the first threshold temperature, the threshold overheat detector outputs a first overheat detection signal to the microcomputer as the microcomputer stop signal, and when the temperature of the output unit exceeds the second threshold temperature, the threshold overheat detector stops the output of the internal power source.

13. The power conversion device according to claim 1 , wherein
the output circuit and the microcomputer are incorporated in a same package.

14. A control circuit comprising:
a microcomputer;
an output circuit controlled by the microcomputer, comprising
an internal power source that supplies a power source to the microcomputer,
a driver that drives an output unit, which converts an input power into a predetermined power and outputs the predetermined power, by a signal from the microcomputer, and
a microcomputer stop transition unit that performs operations comprising, in response to an operation of the control circuit being stopped, outputting a microcomputer stop signal to the microcomputer causing an operation of the microcomputer to transition to a stop state, wherein:

after the microcomputer stop transition unit causes the operation of the microcomputer to transition to the stop state, the microcomputer or the output circuit stops an output of the internal power source; and
in response to the microcomputer stop transition unit detecting a malfunction of the microcomputer that prevents the microcomputer or the output circuit from stopping the output of the internal power source, the microcomputer stop transition unit generates a signal that stops the output of the internal power source.

Assignees

• Sanken Electric Co Ltd

Inventors

• Takada Junichi
• Yoshinaga Mitsutomo
• Nakano Toshihiro
• Imai Koki
• Ohtake Osamu

Classifications

• H02M1/36

  Means for starting or stopping converters · CPC title

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title

• H02H7/1213 Primary

  for DC-DC converters · CPC title

• H02M1/08 Primary

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H02M3/157

  with digital control · CPC title